Virtual Basketball: How Well Do You Shoot? Chun Li & Jingwen Ouyang 6.111 Spring 2007 System Overview velocity x 10 analog x ADXL330 3-Axis Accelerometer 10 analog y 10 velocity y 10 Calibration & Velocity Calculation analog z 10 velocity z vga_colors 24 10 position x 10 Game Display vsync, hsync, hblank position y 10 position z Chun 10 Jingwen Accelerometer & A/D Converter •ADXL330 3-axis Accelerometer •±3g range •Operating voltage 3V •300 mV/g sensitivity •AD7810 10-bit A/D Converter •Sample at 1 kHz Velocity & Position Block Diagram rel_y 20 rel_z 20 acc_x 10 vel_x vel_y 20 Integrator Integrator reset enable acc_y 10 reset Serial Interface enable Integrator height switch[6:0] 7 sens_z 10 sens_y 10 Calibration Serial Interface CONVST DOUTX 10 SCLK CONVST DOUTY 10 SCLK CONVST DOUTZ 10 To all modules Debounce /Synchronize sens_x 10 7 7 7 reset To all modules pos_x pos_y pos_z clk AD7810 vel_z 20 acc_z reset 10 enable SCLK AD7810 Determine Release Velocities 20 Serial Interface analog_x analog_y analog_z ADXL330 3-Axis Accelerometer 20 AD7810 rel_x 27Mhz_clock Reset (button[0]) Calibration • Obtain player height • Calculate initial x, y, z positions • Why: Variances • 0g bias point • sensitivity Game Display Overview Initial positions 10 x 3 labkit_clock DCM pixel_clock Reset Replay Initial speeds 10 x 3 To All reset_sync Debouncer/ Synchronizer replay_sync Game Logic Ball x, y, z Positions Shadow Positions 10 x 3 10 x 3 pixel_count 10 VGA Controller line_count 1 x 4 VGA signals 10 Display Field 24 rgb_signal Game Logic Initial Positions 10 x 3 Initial speeds 10 x 3 Status 2 status Get Ball position 10 x 3 ball_x,y,z (FSM) Get Shadow Position 10 x 3 Shadow_x,y,z Calculations • Speed • Vz = g t + Vz (only vertical direction has acceleration) * t = time between each frame • Position • X = Vx • Y = Vy • X = Vz t+X t+Y t+Z • 3D to 2D conversion • W = Z + X sin(a) – Y sin(b) • U = X cos(a) + Y cos(b) Display Field 10 x 3 ball_x,y,z 3D to 2D ball_x,y Converter pixel_count 10 line_count 10 x 3 Address Counter 10 For ROM 7 ball_addr ROM 2 color_index Color Mapping 24 rgb_ball 24 x 4 RGB Controller rgb signals for the shadow, player, scores, and background, which are obtained similarly 24 rgb_signal Game Display Interface (1) + + + 2 + 4 + Game Display Interface (2) Conclusion • practice shooting without a court • Whenever • Game for the Wii
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